Here's an updated list. Not sure if this is allowed or not, but perhaps there should be a limit to everytime you update your list. I didn't put kaiju movies on the last page, so he's a more accurate list.
Completed
Toho Kaiju Movies
Godzilla (All of them)
Rodan
The Mysterians
Varan, the Unbelievable (Japanese version)
The H-Man
Mothra
Matango
Atragon
Dogora
Frankenstein Conquers the World
War of the Gargantuas
King Kong Escapes
Latitude Zero
Space Amoeba
Rebirth of Mothra (All 3)
Daiei (Kadokawa)
Warning From Space
Gamera (All except for Super Monster Gamera)
Daimajin (All three)
Other Japanese Monster Flicks
Gappa
The Magic Serpent
Monster X Strikes Back-Attack the G8 Summit
Korean Kaiju
Yongary (1967)
Reptilian
The Host
Dragon Wars
Ultraman Shows
Ultraman
Ultraman: The Adventure Begins
Ultraman Tiga
Ultraman Mebius
Ultra Galaxy: Daikaiju Battle
Ultra Galaxy: Daikaiju Battle Never Ending Odyssey
Ultraman Mebius Gaiden: Ghost Rebirth Stage 1 & 2
Ultraman Movies
Ultraman Tiga & Ultraman Dyna: Warriors of the Star of Light
Ultraman Tiga, Ultraman Dyna, and Ultraman Gaia: Battle in Hyperspace
Ultraman Tiga: The Final Odyssey
Ultraman: The Next
Ultraman Mebius & Ultraman Brothers
Superior Ultraman 8 Brothers
Kamen Rider Shows
Kamen Rider Amazon
Kamen Rider ZX Special
Kamen Rider Decade
Kamen Rider Movies
Kamen Rider BLACK: Hurry to Onigashima
Kamen Rider: The First
Kamen Rider: The Next
Kamen Rider Decade: All Riders vs. DaiShocker
Currently watching:
Ultraman Nexus
Kamen Rider BLACK
Hold-a.k.a. On/Off
Johnny Sokko and His Flying Robot
Ultraman Great
Ultraman Powered
Kamen Rider Dragon Knight
Future:
Ultra Seven
Return of Ultraman
Ultraman Ace
Ultraman Taro
Ultraman Leo
Ultraman 80
Ultraman Dyna
Ultraman Gaia
Ultraman Max
Kamen Rider
Kamen Rider V3
Kamen Rider BLACK RX
Kamen Rider Kuuga
Kamen Rider Kabuto
Kamen Rider Double
Half-Human
Gorath
Prophecies of Nostradamus
The War in Space
The X From Outer Space
Super Monster Gamera
AIP Version of Destroy All Monsters
Zone Fighter
Ultraman Zearth (Both movies)
Ultraman Mebius Gaiden: Armored Darkness
Mega Monster Battle: Ultra Galaxy Legends-The Movie